--- /dev/null
+#ident "$Id$"
+/* ----------------------------------------------------------------------- *
+ *
+ * Copyright 2001-2003 H. Peter Anvin - All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
+ * Bostom MA 02111-1307, USA; either version 2 of the License, or
+ * (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * conio.c
+ *
+ * Output to the screen
+ *
+ * FIX THIS: Replace printf() implementation with BSD/MIT-licensed one
+ * from klibc
+ */
+
+#include <com32.h>
+#include <stdarg.h>
+
+#define NULL ((void *)0)
+
+int putchar(int ch)
+{
+ com32sys_t regs;
+
+ memset(®s, 0, sizeof regs);
+
+ if ( ch == '\n' ) {
+ /* \n -> \r\n */
+ putchar('\r');
+ }
+
+ regs.eax.b[1] = 0x02;
+ regs.edx.b[0] = ch;
+ __com32.cs_intcall(0x21, ®s, NULL);
+
+ return ch;
+}
+
+int puts(const char *s)
+{
+ int count = 0;
+
+ while ( *s ) {
+ putchar(*s);
+ count++;
+ s++;
+ }
+
+ return count;
+}
+
+/*
+ * Oh, it's a waste of space, but oh-so-yummy for debugging. It's just
+ * initialization code anyway, so it doesn't take up space when we're
+ * actually running. This version of printf() does not include 64-bit
+ * support. "Live with it."
+ *
+ * Most of this code was shamelessly snarfed from the Linux kernel, then
+ * modified.
+ */
+
+static inline int
+isdigit(int ch)
+{
+ return (ch >= '0') && (ch <= '9');
+}
+
+static int skip_atoi(const char **s)
+{
+ int i=0;
+
+ while (isdigit(**s))
+ i = i*10 + *((*s)++) - '0';
+ return i;
+}
+
+unsigned int atou(const char *s)
+{
+ unsigned int i = 0;
+ while (isdigit(*s))
+ i = i*10 + (*s++ - '0');
+ return i;
+}
+
+static int strnlen(const char *s, int maxlen)
+{
+ const char *es = s;
+ while ( *es && maxlen ) {
+ es++; maxlen--;
+ }
+
+ return (es-s);
+}
+
+#define ZEROPAD 1 /* pad with zero */
+#define SIGN 2 /* unsigned/signed long */
+#define PLUS 4 /* show plus */
+#define SPACE 8 /* space if plus */
+#define LEFT 16 /* left justified */
+#define SPECIAL 32 /* 0x */
+#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
+
+#define do_div(n,base) ({ \
+int __res; \
+__res = ((unsigned long) n) % (unsigned) base; \
+n = ((unsigned long) n) / (unsigned) base; \
+__res; })
+
+static char * number(char * str, long num, int base, int size, int precision
+ ,int type)
+{
+ char c,sign,tmp[66];
+ const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
+ int i;
+
+ if (type & LARGE)
+ digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+ if (type & LEFT)
+ type &= ~ZEROPAD;
+ if (base < 2 || base > 36)
+ return 0;
+ c = (type & ZEROPAD) ? '0' : ' ';
+ sign = 0;
+ if (type & SIGN) {
+ if (num < 0) {
+ sign = '-';
+ num = -num;
+ size--;
+ } else if (type & PLUS) {
+ sign = '+';
+ size--;
+ } else if (type & SPACE) {
+ sign = ' ';
+ size--;
+ }
+ }
+ if (type & SPECIAL) {
+ if (base == 16)
+ size -= 2;
+ else if (base == 8)
+ size--;
+ }
+ i = 0;
+ if (num == 0)
+ tmp[i++]='0';
+ else while (num != 0)
+ tmp[i++] = digits[do_div(num,base)];
+ if (i > precision)
+ precision = i;
+ size -= precision;
+ if (!(type&(ZEROPAD+LEFT)))
+ while(size-->0)
+ *str++ = ' ';
+ if (sign)
+ *str++ = sign;
+ if (type & SPECIAL) {
+ if (base==8)
+ *str++ = '0';
+ else if (base==16) {
+ *str++ = '0';
+ *str++ = digits[33];
+ }
+ }
+ if (!(type & LEFT))
+ while (size-- > 0)
+ *str++ = c;
+ while (i < precision--)
+ *str++ = '0';
+ while (i-- > 0)
+ *str++ = tmp[i];
+ while (size-- > 0)
+ *str++ = ' ';
+ return str;
+}
+
+/* Forward decl. needed for IP address printing stuff... */
+int sprintf(char * buf, const char *fmt, ...);
+
+int vsprintf(char *buf, const char *fmt, va_list args)
+{
+ int len;
+ unsigned long num;
+ int i, base;
+ char * str;
+ const char *s;
+
+ int flags; /* flags to number() */
+
+ int field_width; /* width of output field */
+ int precision; /* min. # of digits for integers; max
+ number of chars for from string */
+ int qualifier; /* 'h', 'l', or 'L' for integer fields */
+
+ for (str=buf ; *fmt ; ++fmt) {
+ if (*fmt != '%') {
+ *str++ = *fmt;
+ continue;
+ }
+
+ /* process flags */
+ flags = 0;
+ repeat:
+ ++fmt; /* this also skips first '%' */
+ switch (*fmt) {
+ case '-': flags |= LEFT; goto repeat;
+ case '+': flags |= PLUS; goto repeat;
+ case ' ': flags |= SPACE; goto repeat;
+ case '#': flags |= SPECIAL; goto repeat;
+ case '0': flags |= ZEROPAD; goto repeat;
+ }
+
+ /* get field width */
+ field_width = -1;
+ if (isdigit(*fmt))
+ field_width = skip_atoi(&fmt);
+ else if (*fmt == '*') {
+ ++fmt;
+ /* it's the next argument */
+ field_width = va_arg(args, int);
+ if (field_width < 0) {
+ field_width = -field_width;
+ flags |= LEFT;
+ }
+ }
+
+ /* get the precision */
+ precision = -1;
+ if (*fmt == '.') {
+ ++fmt;
+ if (isdigit(*fmt))
+ precision = skip_atoi(&fmt);
+ else if (*fmt == '*') {
+ ++fmt;
+ /* it's the next argument */
+ precision = va_arg(args, int);
+ }
+ if (precision < 0)
+ precision = 0;
+ }
+
+ /* get the conversion qualifier */
+ qualifier = -1;
+ if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
+ qualifier = *fmt;
+ ++fmt;
+ }
+
+ /* default base */
+ base = 10;
+
+ switch (*fmt) {
+ case 'c':
+ if (!(flags & LEFT))
+ while (--field_width > 0)
+ *str++ = ' ';
+ *str++ = (unsigned char) va_arg(args, int);
+ while (--field_width > 0)
+ *str++ = ' ';
+ continue;
+
+ case 's':
+ s = va_arg(args, char *);
+ len = strnlen(s, precision);
+
+ if (!(flags & LEFT))
+ while (len < field_width--)
+ *str++ = ' ';
+ for (i = 0; i < len; ++i)
+ *str++ = *s++;
+ while (len < field_width--)
+ *str++ = ' ';
+ continue;
+
+ case 'p':
+ if (field_width == -1) {
+ field_width = 2*sizeof(void *);
+ flags |= ZEROPAD;
+ }
+ str = number(str,
+ (unsigned long) va_arg(args, void *), 16,
+ field_width, precision, flags);
+ continue;
+
+
+ case 'n':
+ if (qualifier == 'l') {
+ long * ip = va_arg(args, long *);
+ *ip = (str - buf);
+ } else {
+ int * ip = va_arg(args, int *);
+ *ip = (str - buf);
+ }
+ continue;
+
+ case '%':
+ *str++ = '%';
+ continue;
+
+ /* integer number formats - set up the flags and "break" */
+ case 'o':
+ base = 8;
+ break;
+
+ case 'X':
+ flags |= LARGE;
+ case 'x':
+ base = 16;
+ break;
+
+ case 'd':
+ case 'i':
+ flags |= SIGN;
+ case 'u':
+ break;
+
+ default:
+ *str++ = '%';
+ if (*fmt)
+ *str++ = *fmt;
+ else
+ --fmt;
+ continue;
+ }
+ if (qualifier == 'l')
+ num = va_arg(args, unsigned long);
+ else if (qualifier == 'h') {
+ num = (unsigned short) va_arg(args, int);
+ if (flags & SIGN)
+ num = (short) num;
+ } else if (flags & SIGN)
+ num = va_arg(args, int);
+ else
+ num = va_arg(args, unsigned int);
+ str = number(str, num, base, field_width, precision, flags);
+ }
+ *str = '\0';
+ return str-buf;
+}
+
+int sprintf(char * buf, const char *fmt, ...)
+{
+ va_list args;
+ int i;
+
+ va_start(args, fmt);
+ i=vsprintf(buf,fmt,args);
+ va_end(args);
+ return i;
+}
+
+int printf(const char *fmt, ...)
+{
+ char printf_buf[1024];
+ va_list args;
+ int printed;
+
+ va_start(args, fmt);
+ printed = vsprintf(printf_buf, fmt, args);
+ va_end(args);
+
+ puts(printf_buf);
+
+ return printed;
+}
+
#include <com32.h>
+#include <stdarg.h>
#define NULL ((void *)0)
+int printf(const char *, ...);
static inline void memset(void *buf, int ch, unsigned int len)
{
*dst = '\0';
}
+static void printregs(const com32sys_t *r)
+{
+ printf("eflags = %08x ds = %04x es = %04x fs = %04x gs = %04x\n"
+ "eax = %08x ebx = %08x ecx = %08x edx = %08x\n"
+ "ebp = %08x esi = %08x edi = %08x esp = %08x\n",
+ r->eflags.l, r->ds, r->es, r->fs, r->gs,
+ r->eax.l, r->ebx.l, r->ecx.l, r->edx.l,
+ r->ebp.l, r->esi.l, r->edi.l, r->_unused.l);
+}
+
int __start(void)
{
unsigned int ax,cx,dx,es,si,di,t;
com32sys_t inreg,outreg;
+ char *p;
+ /* Test null system call */
+ inreg.eflags.l = 0xffffffff;
+ inreg.eax.l = 0x11110000;
+ inreg.ecx.l = 0x22222222;
+ inreg.edx.l = 0x33333333;
+ inreg.ebx.l = 0x44444444;
+ inreg.ebp.l = 0x55555555;
+ inreg.esi.l = 0x66666666;
+ inreg.edi.l = 0x77777777;
+ inreg.ds = 0xaaaa;
+ inreg.es = 0xbbbb;
+ inreg.fs = 0xcccc;
+ inreg.gs = 0xdddd;
+ printregs(&inreg);
+ __com32.cs_intcall(0x22, &inreg, &outreg);
+ printregs(&outreg);
+ printf("----\n");
+
memset(&inreg, 0, sizeof inreg);
memset(&outreg, 0, sizeof outreg);
strcpy(__com32.cs_bounce, "test.txt");
inreg.eax.w[0] = 0x0006; // Open file
inreg.esi.w[0] = OFFS(__com32.cs_bounce);
inreg.es = SEG(__com32.cs_bounce);
+ printregs(&inreg);
__com32.cs_intcall(0x22, &inreg, &outreg);
+ printregs(&outreg);
+ printf("----\n");
- si = outreg.esi.w[0];
- cx = outreg.ecx.w[0];
- ax = outreg.eax.l;
-
- if ( ax > 65536 )
- ax = 65536; /* Max in one call */
+ si = outreg.esi.w[0]; /* File handle */
+ cx = outreg.ecx.w[0]; /* Block size */
+ ax = outreg.eax.l; /* File length */
while ( si ) {
- t = (ax+cx-1)/cx;
-
+ /* We can only read 64K per call */
+ t = ( ax > 65536 ) ? 65536/cx : (ax+cx-1)/cx;
+
memset(&inreg, 0, sizeof inreg);
inreg.esi.w[0] = si;
- inreg.ecx.w[0] = t;
+ inreg.ecx.w[0] = t; /* Block count */
inreg.eax.w[0] = 0x0007; // Read file
inreg.ebx.w[0] = OFFS(__com32.cs_bounce);
inreg.es = SEG(__com32.cs_bounce);
- __com32.cs_intcall(0x22, &inreg, &inreg);
- si = inreg.esi.w[0];
+ printregs(&inreg);
+ __com32.cs_intcall(0x22, &inreg, &outreg);
+ printregs(&outreg);
+ printf("----\n");
+ si = outreg.esi.w[0];
- // This is broken if we hit null, but works for (DOS) text files
- memset(&inreg, 0, sizeof inreg);
- inreg.eax.w[0] = 0x0002;
- inreg.ebx.w[0] = OFFS(__com32.cs_bounce);
- inreg.es = SEG(__com32.cs_bounce);
- __com32.cs_intcall(0x22, &inreg, NULL);
+ /* Print the buffer */
+ t = (ax < 65536) ? ax : 65536;
+ p = __com32.cs_bounce;
+ while ( t ) {
+ putchar(*p++);
+ t--;
+ ax--;
+ }
}
-
+
return 0;
}
projects / platform / upstream / syslinux.git / commitdiff